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Consider a solution that is 2.1×10?2 M in Fe2+and 1.8×10?2 M in Mg2+. I know that the...

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Chemistry

Consider a solution that is 2.1×10?2 M in Fe2+and1.8×10?2 M in Mg2+.

I know that the Fe2+ was the first to precipitate and that theminimum concentration of K2CO3 is

1.5×10?9

  M

What I need to know is What is theremaining concentration of the cation that precipitates first, whenthe other cation just begins to precipitate?

Answer & Explanation Solved by verified expert
4.2 Ratings (960 Votes)
first consider Fe2 ions FeC03 Fe2 C032 Ksp Fe2 C032 given Fe2 21 x 102 also ksp of FeC03 is 307 x 1011 so 307 x 1011 21 x 102 x C032 C032 1462 x 109 M so Fe2    See Answer
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